Question

2. Without changing the ownership of test directory in your home directory, explain what the chmod command would be to make sure that super, as a member of the is229 group, had no ability to read, write, or execute files in the test directory.

Answer 1

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Answer:

Without changing the ownership of the 'test' directory we can edit the file of directory permissions to restrict only the owner to be able to access the files for that we can use chmod command to change the file permissions.

example :

STEP 1 : create a directory named 'test' using mkdir test

STEP 2 : run command ls -l test to see the file permissions

it should look like : drwxrw-rw- 2 nrsc nrsc 38 Feb 17 11:45 test

STEP 3 : run sudo su to enter into root mode and then create a file named vai.txt and exter some text in it.

Lets change the permissions using chmod

chmod -R 070 test

It must look like this :

d---rwx--- 2 nrsc nrsc 38 Feb 17 11:50 test

STEP 4: Exit root mode using Ctrl + D

STEP 5 : try to run cat test/vai.txt

it will give you this output

[nrsc@rhel-orf1 ~]$ cat test/vai.txt
cat: test/vai.txt: Permission denied
[nrsc@rhel-orf1 ~]$ cd test
-bash: cd: test: Permission denied

IF you want that no one should be able to access that directory do

chmod -R 000 test

this will prevent anyone from accessing it.

Hence we have stopped a particular user from accessing a file and directory using chmod without changing the ownership of a directory.